William c



(No Model.)

W. C. DILLMAN.

ANNUNGIATOR. No. 472,440.

Patented Apr. 5, 1892.

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W MMM A TTUHNEYS UNITED STATES PATENT OFFICE.

VILLAM O. DILLMAN, OF BROOKLYN, ASSIGNOR TO OXVEN VALSH, OF

NEW YORK, N. Y.

ANNUNCIATOR.

SPECFICATION forming part of Letters Patent No. 472,440, dated April 5,1892.

Application tiled December 22, 1891. Serial No. 415,864. (No model.)

To all whom t may concern:

Be it known that I, WILLIAM C. DILLMAN, of Brooklyrnin the county ofKings and State of New York, have invented a new and ImprovedAnnunciator, of which the following is a full, clear, and exactdescription.

My invention relates to improvements in that class of annunciators whichare used in connection with speaking-tubes to announce when a person isat one end of the tube and wishes to converse with a person at the otherend.

The object of my invention is to produce an extremely simple and cheapannunciator which may be easily applied to any ordinary speaking-tubeand which may be easily operated bythe breath so as to momentarily closea circuit in which an electric bell is included, thus ringing the belland attracting attention to the tube, and also breaking the circuitquickly, so as to avoid excessive ringing of the bell and exhaustion ofthe battery.

To this end myinvention consists in an annunciator the construction ofwhich will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures and letters of referenceindicate corresponding parts in both views.

Figure 1 is a broken vertical longitudinal section of the annunciatorembodying my invention, showing also a diagram of the electric circuit;and Fig. 2 is a crosssection through the tube on the line 2 2 in Fig. 1.

The tube 10 is of the usual kind and is supported at its mouth in a wall11, the end of the tube being carried by a flange on the faceplate 12,which is secured to the wall, and to which is hinged a lid 13, havingthe usual mouth-piece 11 and having the ordinary slide- Valve 15, whichnormally closes the mouthpiece, but which is raised when the tube is tobe used. On the back of the lid 13 is acatch 16, which is adapted to beengaged by a swinging latch 17, mounted in a recess of the wall 11, andthe latch thus holds the lid in a raised position. Above the latch is aInagnet 18, which is supported by an arm 19, and when the annunciator isused the circuit through the magnet is closed, thus raising the latch17, which serves as an armature, and releasing the lid 13, which willdrop by reason of the weight of the mouthpiece and will rest upon aguard-rail 20, as shown by dotted lines in Fig. 1.

The above construction is shown in the United States Patent No. 456,803,dated July 2S, 1891, and forms no part of this invention.

If desired, any other suitable catch maybe used, or the annunciator maybe operated without regard to the operation of the lid. Adjacent to themou th of the tube and within the bore thereof is an air-chute 21, whichis of a tapering form, the wider end opening toward the end of the chuteopposite the mouth, and the narrower end of the chute terminates beneatha perforation 22 in the upper wall of the tube 10, and this perforationis normally covered by a swinging contact-arm 23, which is very light,so that it may be easily raised by the breath, and which has a cup-likefree end 24, which covers the perforation 22, and which by holding theair enables the contact to be easily raised. The contact-arm 23 ispivoted on a support 23a on the top of the tube 10, and the contact-armforms one terminal of an electric circuit, which includes a bell andwhich will be described below. Above the free end of the contact-arm 23and in the path of the said arm is another contact 25, which is securedto an insulating-block 2G on the top of the tube and which forms theother terminal of the bellcircuit. The bell 27 is the ordinary electricbell and may be arranged in any convenient place adjacent to the mouthof the tube.

The current for operating the bell is supplied by a batteryA, whichconnects by a wire a with the contact-arm 23 and by a wire a with themagnet 1S and with one binding-post of the bell 27. The otherbinding-post of the bell connects by a wire a2 with the contact 25. Whenthe contacts 23 and 25 touch, the circuit will be closed and will befrom the battery A through the wire a, the contact-arm 23,

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that the air will be somewhat condensed and will pass upward through thetube with considerable force.

I am aware that it is not new to operate a swinging contact bymeans ofair blown through a speaking-tube, so as to close a circuit through anelectric bell, and I do not claim` this feature, broadly, as myinvention, but claim the mechanism shown, which enables the operationdescribed to be easily performed.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. The combination, with the perforated tube and theair-chute mounted within the tube and terminating beneath theperforation, of a swinging contact mounted above the perforation andforming one terminal of a circuit whichv includes a bell, and al fixedcontact forming the other. terminal and arranged in the path of theswinging. contact, substantially as described.

2. The combination, with the perforated `tube and the air-chute arrangedto divert air through the perforation, of a swinging contact mountedupon the tube and having a cup-shaped free end to cover the perforation,

,said contact forming one. terminal of an electric circuit whichincludes a bell, and a fixed contact forming the other terminal and arranged in the path of the swinging contact, substantially as described.

WILLIAM c. DILLMAN.

Witnesses WARREN B.,HUfrcHINsoN, C. SEDGWICK.

